Add -e flag to explain what the previous smiley face means. This

requires us to also know what the previous return signal is, so
if XD is given a return code, it passes it through when finishing
execution.

config.mk

@@ -16,6 +16,10 @@ ERR =
 # uncomment to enable errors
 # ERR = -DERR
 
+EXPLAIN =
+# comment to disable explinations
+EXPLAIN = -DEXPLAIN
+
 # add compilation details to VERSION variable
 ifneq ($(GIT),)
 	VERSION := $(VERSION)"\\nlibgit2 "`$(PKG_CONFIG) --modversion $(GITLIB)`
@@ -25,5 +29,10 @@ ifeq ($(ERR),)
 else
 	VERSION := $(VERSION)"\\nerrors enabled"
 endif
+ifeq ($(EXPLAIN),)
+	VERSION := $(VERSION)"\\nexplinations disabled"
+else
+	VERSION := $(VERSION)"\\nexplinations enabled"
+endif
 
 CC = cc